Boston honors lost flight crews

BOSTON, Massachusetts (CNN) --About 20,000 people attended a outdoor service Wednesday in Boston honoring the American and United Airlines crew members killed in the September 11 terrorist attacks on the World Trade Center.

The two Boeing 767s used in the attacks on the towers, American Airlines Fight 11 and United Airlines Flight 175, were hijacked from Boston's Logan International Airport.

On board the two airliners were 157 people, including 22 crew members.

Members of the clergy from several denominations participated in the service Wednesday, along with Boston Mayor Tom Menino, representatives of the Massachusetts Port Authority, which operates Logan International Airport, as well as Massachusetts State Police and Boston City Police.

White doves were released after the 22 crew members' names were read.

The Boston Symphony Orchestra and singer/actress Bette Midler also performed at the ceremony.